//
//  TLWebViewController.m
//  TLChat
//
//  Created by 李伯坤 on 16/2/10.
//  Copyright © 2016年 李伯坤. All rights reserved.
//

#import "TLWebViewController.h"
#import <MobClick.h>

#define     WEBVIEW_NAVBAR_ITEMS_FIXED_SPACE    9

@interface TLWebViewController ()

@property (nonatomic, strong) WKWebView *webView;

@property (nonatomic, strong) UIProgressView *progressView;

@property (nonatomic, strong) UIBarButtonItem *backButtonItem;

@property (nonatomic, strong) UIBarButtonItem *closeButtonItem;

@property (nonatomic, strong) UILabel *authLabel;

@end

@implementation TLWebViewController

- (id)init
{
    if (self = [super init]) {
        self.useMPageTitleAsNavTitle = YES;
        self.showLoadingProgress = YES;
    }
    return self;
}

- (void)loadView
{
    [super loadView];
    [self.view addSubview:self.authLabel];
    [self.view addSubview:self.webView];
    [self.view addSubview:self.progressView];
}

- (void)viewDidLoad
{
    [super viewDidLoad];
    [self setAutomaticallyAdjustsScrollViewInsets:NO];
    [self.view setBackgroundColor:[UIColor colorBlackBG]];
    [self.webView.scrollView setBackgroundColor:[UIColor clearColor]];
    for (id vc in self.webView.scrollView.subviews) {
        NSString *className = NSStringFromClass([vc class]);
        if ([className isEqualToString:@"WKContentView"]) {
            [vc setBackgroundColor:[UIColor whiteColor]];
            break;
        }
    }
    [self.webView addObserver:self forKeyPath:@"estimatedProgress" options:NSKeyValueObservingOptionNew context:NULL];
    [self.webView.scrollView addObserver:self forKeyPath:@"backgroundColor" options:NSKeyValueObservingOptionNew context:NULL];
}

- (void)viewWillAppear:(BOOL)animated
{
    [super viewWillAppear:animated];
    [MobClick beginLogPageView:@"WebVC"];
    [self.progressView setProgress:0.0f];
    [self.webView loadRequest:[NSURLRequest requestWithURL:TLURL(self.url)]];
    if (!self.disableBackButton && self.navigationItem.leftBarButtonItems.count <= 2) {
        [self.navigationItem setLeftBarButtonItems:@[[UIBarButtonItem fixItemSpace:-WEBVIEW_NAVBAR_ITEMS_FIXED_SPACE], self.backButtonItem]];
    }
}

- (void)viewWillDisappear:(BOOL)animated
{
    [super viewWillDisappear:animated];
    [MobClick endLogPageView:@"WebVC"];
    [[UIApplication sharedApplication] setNetworkActivityIndicatorVisible:NO];
}

- (void)dealloc
{
    [self.webView removeObserver:self forKeyPath:@"estimatedProgress"];
    [self.webView.scrollView removeObserver:self forKeyPath:@"backgroundColor"];
#ifdef DEBUG_MEMERY
    NSLog(@"dealloc WebVC");
#endif
}


#pragma mark - Public Methods -
- (void)setUrl:(NSString *)url
{
    _url = url;
    if ([self.view isFirstResponder]) {
        [self.progressView setProgress:0.0f];
        [self.webView loadRequest:[NSURLRequest requestWithURL:TLURL(self.url)]];
    }
}

- (void)setShowLoadingProgress:(BOOL)showLoadingProgress
{
    _showLoadingProgress = showLoadingProgress;
    [self.progressView setHidden:!showLoadingProgress];
}


#pragma mark - Event Response -
- (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary *)change context:(void *)context {
    
    if (self.showLoadingProgress && [keyPath isEqualToString:@"estimatedProgress"] && object == self.webView) {
        [self.progressView setAlpha:1.0f];
        [self.progressView setProgress:self.webView.estimatedProgress animated:YES];
        
        if(self.webView.estimatedProgress >= 1.0f) {
            [UIView animateWithDuration:0.3 delay:0.3 options:UIViewAnimationOptionCurveEaseOut animations:^{
                [self.progressView setAlpha:0.0f];
            } completion:^(BOOL finished) {
                [self.progressView setProgress:0.0f animated:NO];
            }];
        }
    }
    else if ([keyPath isEqualToString:@"backgroundColor"] && object == self.webView.scrollView) {
        UIColor *color = [change objectForKey:@"new"];
        if (!CGColorEqualToColor(color.CGColor, [UIColor clearColor].CGColor)) {
            [object setBackgroundColor:[UIColor clearColor]];
        }
    }
}

- (void)navBackButotnDown
{
    if (self.webView.canGoBack) {
        [self.webView goBack];
        [self.navigationItem setLeftBarButtonItems:@[[UIBarButtonItem fixItemSpace:-WEBVIEW_NAVBAR_ITEMS_FIXED_SPACE], self.backButtonItem, self.closeButtonItem]];
    }
    else {
        [self.navigationController popViewControllerAnimated:YES];
    }
}

- (void)navCloseButtonDown
{
    [self.navigationController popViewControllerAnimated:YES];
}


#pragma mark - Delegate -
//MARK: WKNavigationDelegate

// 开始加载页面
- (void)webView:(WKWebView *)webView didStartProvisionalNavigation:(WKNavigation *)navigation
{
    [[UIApplication sharedApplication] setNetworkActivityIndicatorVisible:YES];
}

// 开始返回页面内容
- (void)webView:(WKWebView *)webView didCommitNavigation:(WKNavigation *)navigation
{
    
}

// 加载完成
- (void)webView:(WKWebView *)webView didFinishNavigation:(WKNavigation *)navigation
{
    [[UIApplication sharedApplication] setNetworkActivityIndicatorVisible:NO];
    if (self.useMPageTitleAsNavTitle) {
        [self.navigationItem setTitle:webView.title];
        [self.authLabel setText:[NSString stringWithFormat:@"网页由 %@ 提供", webView.URL.host]];
        [self.authLabel setHeight:[self.authLabel sizeThatFits:CGSizeMake(self.authLabel.width, MAXFLOAT)].height];
    }
}

// 加载失败
- (void)webView:(WKWebView *)webView didFailProvisionalNavigation:(WKNavigation *)navigation withError:(NSError *)error
{
    [[UIApplication sharedApplication] setNetworkActivityIndicatorVisible:NO];
}

// 页面跳转处理
// 接收到服务器跳转请求之后调用
- (void)webView:(WKWebView *)webView didReceiveServerRedirectForProvisionalNavigation:(WKNavigation *)navigation
{
    
}

// 在收到响应后，决定是否跳转
- (void)webView:(WKWebView *)webView decidePolicyForNavigationResponse:(WKNavigationResponse *)navigationResponse decisionHandler:(void (^)(WKNavigationResponsePolicy))decisionHandler
{
    decisionHandler(WKNavigationResponsePolicyAllow);
}

// 在发送请求之前，决定是否跳转
- (void)webView:(WKWebView *)webView decidePolicyForNavigationAction:(WKNavigationAction *)navigationAction decisionHandler:(void (^)(WKNavigationActionPolicy))decisionHandler
{
    NSString *urlString = navigationAction.request.URL.absoluteString;
    if ([urlString hasPrefix:@"itms-apps://itunes.apple.com"] || [urlString hasPrefix:@"https://itunes.apple.com"] || [urlString hasPrefix:@"itms-services:"]) {
        [[UIApplication sharedApplication] openURL:navigationAction.request.URL];
        decisionHandler(WKNavigationActionPolicyCancel);
    }
    else {
        decisionHandler(WKNavigationActionPolicyAllow);
    }
}

//MARK: WKUIDelegate
// web界面中有弹出警告框
- (void)webView:(WKWebView *)webView runJavaScriptAlertPanelWithMessage:(nonnull NSString *)message initiatedByFrame:(nonnull WKFrameInfo *)frame completionHandler:(nonnull void (^)(void))completionHandler
{
    UIAlertController *alertController = [UIAlertController alertControllerWithTitle:message message:nil  preferredStyle:UIAlertControllerStyleAlert];
    [alertController addAction:[UIAlertAction actionWithTitle:@"确定" style:UIAlertActionStyleCancel handler:^(UIAlertAction *action) {
        completionHandler();
    }]];
    
    [self presentViewController:alertController animated:YES completion:^{}];
}

// web界面中有确认框
- (void)webView:(WKWebView *)webView runJavaScriptConfirmPanelWithMessage:(nonnull NSString *)message initiatedByFrame:(nonnull WKFrameInfo *)frame completionHandler:(nonnull void (^)(BOOL))completionHandler
{
    UIAlertController *alertController = [UIAlertController alertControllerWithTitle:message
                                                                             message:nil
                                                                      preferredStyle:UIAlertControllerStyleAlert];
    [alertController addAction:[UIAlertAction actionWithTitle:@"确定"
                                                        style:UIAlertActionStyleDefault
                                                      handler:^(UIAlertAction *action) {
                                                          completionHandler(YES);
                                                      }]];
    [alertController addAction:[UIAlertAction actionWithTitle:@"取消"
                                                        style:UIAlertActionStyleCancel
                                                      handler:^(UIAlertAction *action){
                                                          completionHandler(NO);
                                                      }]];
    
    [self presentViewController:alertController animated:YES completion:^{}];
}

// web界面中有弹出输入框
- (void)webView:(WKWebView *)webView runJavaScriptTextInputPanelWithPrompt:(nonnull NSString *)prompt defaultText:(nullable NSString *)defaultText initiatedByFrame:(nonnull WKFrameInfo *)frame completionHandler:(nonnull void (^)(NSString * _Nullable))completionHandler {
    completionHandler(@"Client Not handler");
}


#pragma mark - Getter -
- (WKWebView *)webView
{
    if (_webView == nil) {
        _webView = [[WKWebView alloc] initWithFrame:CGRectMake(0, HEIGHT_NAVBAR + HEIGHT_STATUSBAR, WIDTH_SCREEN, HEIGHT_SCREEN - HEIGHT_NAVBAR - HEIGHT_STATUSBAR)];
        [_webView setAllowsBackForwardNavigationGestures:YES];
        [_webView setNavigationDelegate:self];
        [_webView setUIDelegate:self];
        [_webView setAutoresizingMask:UIViewAutoresizingFlexibleWidth|UIViewAutoresizingFlexibleHeight];
    }
    return _webView;
}

- (UIProgressView *)progressView
{
    if (_progressView == nil) {
        _progressView = [[UIProgressView alloc] initWithFrame:CGRectMake(0, HEIGHT_NAVBAR + HEIGHT_STATUSBAR, WIDTH_SCREEN, 10.0f)];
        [_progressView setTransform: CGAffineTransformMakeScale(1.0f, 2.0f)];
        [_progressView setProgressTintColor:[UIColor colorGreenDefault]];
        [_progressView setTrackTintColor:[UIColor clearColor]];
    }
    return _progressView;
}

- (UIBarButtonItem *)backButtonItem
{
    if (_backButtonItem == nil) {
        _backButtonItem = [[UIBarButtonItem alloc] initWithBackTitle:@"返回" target:self action:@selector(navBackButotnDown)];
    }
    return _backButtonItem;
}

- (UIBarButtonItem *)closeButtonItem
{
    if (_closeButtonItem == nil) {
        _closeButtonItem = [[UIBarButtonItem alloc] initWithTitle:@"关闭" style:UIBarButtonItemStylePlain target:self action:@selector(navCloseButtonDown)];
    }
    return _closeButtonItem;
}

- (UILabel *)authLabel
{
    if (_authLabel == nil) {
        _authLabel = [[UILabel alloc] initWithFrame:CGRectMake(20, HEIGHT_NAVBAR + HEIGHT_STATUSBAR + 13, WIDTH_SCREEN - 40, 0)];
        [_authLabel setFont:[UIFont systemFontOfSize:12.0f]];
        [_authLabel setTextAlignment:NSTextAlignmentCenter];
        [_authLabel setTextColor:[UIColor colorTextGray]];
        [_authLabel setNumberOfLines:0];
    }
    return _authLabel;
}

@end